Inclusion of preceding beamlines

[teddyrendahl]

Expected Behavior

Now that lightpath has a hardcoded configuration we can tell all the devices that need to be loaded quite easily. It would be nice if downstream beamlines are included as well, maybe contained within a namespace i.e

mfx_dg1_pim
xrt.hxx_valve

Current Behavior

Only devices on the beamline that match the hutch are included.

[ZLLentz]

If we do load these devices I expect the existing infrastructure to automatically create namespaces for them of the form beamline.stand.name... so for us, that's unfortunately hxd.hxx.valve, for example. We may need to rethink how we set these namespaces up.